John Harrison, Copley medallist and the £20,000 longitude prize /
Quill, H.(Humphrey)1897-1987.
Penney, David.
[Ticehurst] Antiquarian Horological Society
[1976]
' ... originally published in "Notes and Records of the Royal Society" (Vol. 18, no. 2, December 1963[)] ... [and now published] in an amended form ... ' - Preface
Harrison, John, 1693-1776.
Clock and watch making.
Longitude.
Astronomical clocks.